C# 0 The Complete Reference

SortedList

. It reworks the employee 

database example one more time. In this version, the database is stored in a 

SortedList

.

// Demonstrate a SortedList.

using System;

using System.Collections.Generic;

class GenSLDemo {

  static void Main() {

    // Create a sorted SortedList for

    // employee names and salary.

    SortedList sl =

      new SortedList();

public int IndexOfValue(TV 

v

)

Returns the index of the first occurrence of the 

value specified by 

v.

 Returns –1 if the value is not in 

the list.

public bool Remove(TK 

k

)

Removes the key/value pair associated with 

k

 from 

the list. Returns true if successful. Returns false if 

k

is not in the list.

public void RemoveAt(int 

idx

)

Removes the key/value pair at the index specified 

by

idx.

public void TrimExcess( )

Removes the excess capacity of the invoking list.

T

ABLE

 24-18 

Several Commonly Used Methods Defi ned by 

SortedList 

(continued)

Method

Description

www.freepdf-books.com

---

794

 

P a r t   I I :  

E x p l o r i n g   t h e   C #   L i b r a r y

    // Add elements to the collection.

    sl.Add("Butler, John", 73000);

    sl.Add("Swartz, Sarah", 59000);

    sl.Add("Pyke, Thomas", 45000);

    sl.Add("Frank, Ed", 99000);

    // Get a collection of the keys.

    ICollection c = sl.Keys;

    // Use the keys to obtain the values.

    foreach(string str in c)

      Console.WriteLine("{0}, Salary: {1:C}", str, sl[str]);

    Console.WriteLine();

  }

}

The output is shown here:

Butler, John, Salary: $73,000.00

Frank, Ed, Salary: $99,000.00

Pyke, Thomas, Salary: $45,000.00

Swartz, Sarah, Salary: $59,000.00

As the output shows, the list is sorted based on employee name, which is the key.